ProMag COLA37 9mm 18-Rd Blued Steel Magazine for Colt 1911

The ProMag COLA37 is a high-capacity 9mm replacement magazine built specifically for the Colt 1911 platform. This extended magazine delivers an 18-round capacity, giving 1911-pattern shooters significantly more firepower than the standard 9-round 1911 mag without sacrificing reliable feeding.

Constructed from heat-treated steel with a protective blued finish, the COLA37 is built to withstand repeated range use. The steel body is paired with a low-friction polymer follower for smooth, consistent round presentation. The blued surface delivers classic 1911-style looks and helps the magazine resist corrosion during regular handling.

Designed as a direct drop-in fit for Colt 1911 pistols and other 1911-pattern 9mm Luger handguns, the COLA37 is a proven choice for target shooting, range training, and anyone seeking extra capacity from their 1911. ProMag has built this magazine to exacting tolerances for years of dependable service.